Hi Hanazaki,
You should use imageshack.us instead of photobucket, it only allows 800x600 max ... And MT takes 1024x768 at the least!
So I hope you just had it resized for that, or you'll have to redo it again, not fun.
Well I see you used some brushes in the background, looks pretty good.
I don't like the text, then again I'm not a fan of text in wallpapers ... Maybe change the font, make it smaller.
The moon seems a bit out of place, the lack of colour is kind of boring. Perhaps get a coloured scan (or don't colour
filter over the one you have if that's the case) Just the background and characters will POP out more.

Err, where's your siggy?
The text, of course, looks so horrible. The quality of the scan is bad. Background looks like those typical
going-to-be-deleted walls.
So, here's the suggestions:
-Vector the scan, if you can. (Or paint-over it)
-Change the background. (I don't have any idea for great backgrounds, but please, don't put sparkling stars and weird
moon like that)
-Change the text, chooose smaller one.
-Remove the border.
-Yah, bigger resolution of course.

okie let me star of with the wordings, i dun like it too, though i noe it's the effect and all, it seems like it was
extracted, try using some cleaner fonts. scan looks pixeled, maybe find better scan! ^^ since everythign is
blue....ermmm...not very interesting,one sec it may look nice than another sec, it seems plain and boring, try making it
more lively, to give some feelings to the wall, it would make it so much livelier, and when you put snow, and moon, the
wallie seems very still, as well,in the wallie there are some blots of spatter, try to clean it up a little! ^^ hope
that helped! ^^ ganbatte ne! ^^